[1]}, in their chemical analysis of high resolution
spectra of M giants in symbiotic stars, found that the recurrent novae and
accreting-only systems T CrB and RS Oph show an over-abundance of \(^7\) Li in
their spectra. None of the other symbiotic stars in their large sample
showed \(^7\) Li enhancement and none was known to have undergone nova
outbursts similar to T CrB and RS Oph. The over-abundance of \(^7\) Li in T
CrB has been recently revised upward to A(Li) = 2.4\(\pm \) 0.1 by
[2]}. The apparent link between \(^7\) Li and nova
outbursts has been further reinforced when the symbiotic star V407 Cyg
erupted in 2010. \(^7\) Li over-abundance was discovered earlier in V407 Cyg
by [3]} at a time when the object was simply known as
a Mira variable with a possible companion, and therefore attributed to
indigenous production via the [4]} mechanism
activated in the Mira variable. We know now that also V407 Cyg
undergoes nova outbursts, and this sheds an alternative explanation for its
\(^7\) Li overabundance.
